The Dexter 4″ Traditional oyster knife with beech wood Boston pattern Handle knife features a high carbon steel blade. Made in U.S.A.Care: Because these have a wood handle and high carbon steel, they should be hand washed and dried. The blade will get a black patina with use. Avoid rust by adding a coat of vegetable oil. Ask the old timers, they swear by them.WARNING: Cancer and Reproductive Harm -www.P65Warnings.ca.gov